Virgil r



(No Model.)

V. R. DUNNING.

L0 GK.

No. 589,940. Patented Sept. `14, 1897.

' 95' v`it!1ilIimlllllllllllllllllll Nl 7 4 et tt..` \f7 y /a n? f lllvl gm Attorney Nrrnn STATES VIRGIL R. DUNNING, QF MANKATO, MINNESOTA.

LOCK.

SPECIFICATION forming part of Letters PatentrNo.i589,94Q, datedSeptember 14, 1897. Application tiled November 6,1896. SerialNo.611,260. (No model.)

To all whom t may coince/vt:

Be it known that I, VIRGIL R. DUNNING, a citizen of the United States,residing at Mankato, in the county of Blue Earth and State of` `thischaracter by means of which the latchbar and locking-bolt act inconjunction with each other, so that when the latter is in its lockedposition it will be impossible to operate the former until the key hasbeen applied to shift the locking-bolt.

The invention consists of a slidingly-mounted -latch-bar, a spring fornormally holding said latch-bar in its outer position, aslidinglymounted locking-bolt, means for shifting said locking-boltbymeans of a key, stops on said bolt, a pivotally-1nounted bell-cranklever having a tooth or projection thereon adapted to engage said stops,a swinging barpivoted to the latch-bar and connected through a pitmanwith the upper end of said bell-crank lever, means actuated by theturning of the door-knob for moving said swinging bar,apivotally-mounted stop-piece having shoulders thereon adapted to engagethe rear end of said latch-bar, a pitman pivoted thereto and leadingdownwardly therefrom, Vand a bell-crank lever, to one arm of which thelower'end of said pitrnan isconnected, the

other arm of said lever lying within the path of movement of saidlocking-bolt and adapt-v ed to be operated thereby when the latter isthrown to its rearward position.

The invention also 'consists in other details of 'construction andcombinations of parts which will be hereinafter m ore fully describedand claimed.

In the drawings forming part of this speciiication, Figure l representsa view of the lock-casin g with one of the side plates thereof removedto show the operative mechanism, the latch-bar and locking-bolt beingshown in the positions which they assume when locked. Fig. 2 is asimilar View of the same, showing slot l5 to the rear end ofthelatclnbar 3. ilower end of the swinging bar 14C has an exthe parts inthe positions they assume when the door is unlocked.`

Like reference-numerals indicate like parts in both views. i

The lock-casing l is adapted to be secured to `the door in anysuitablemanner and is made is alockingbolt G, having lugs or projections 7 v 7thereon, by means of which the same may be shifted from one position toanother through the medium of a hey inserted through the keyhole-slot 8.The upper surface of the lock- .ing-bolt 6 has notches or recesses 9 9formed therein, into which is adapted to fit, according to the `positionVof the lockingbolt, a tooth `or projection l() upon the outer end ofone arm of a bellscrank lever ll, fulcrumed at l2 to the sides of thecasing l. The other arm of said bell-crank lever is connected through ap-itman 13 with the blower end of a swinging rod or bar 14.-, which ispivoted in an elongated The tension 16 thereto which extends at rightanthe sides of the casing l.

`19 represents the `knob-shaft, vto which is connected a block`20,7having a flat side which normally lies substantially parallel tothe swinging rod or bar 14 and by means of which said rod or bar` may beshifted to one position or the other. A spring 2l'tends`to 4hold thelower end of the rod or bar ltnormally in the position in which it isshown inV Fig. l.

Pivoted at its rear end to the sides of the casing l is a stop-bar 22,provided with two notches or shoulders 23 and 24, respectively, againstwhich the rear end of the latch-bar 3 is adapted to be thrown accordingto the position to which said latch-bar 3 is turned. The free end ofsaid bar is normally urged downwardly by means of a spring 25. Piv- ICOoted to the stop-bar 22 and extending downwardly therefrom is a rod orpitman 26, which is connected at its lower end to one arm of abell-crank lever 27, fulcrumed at 28 to the sides of the casing 1 andhaving its other arm 29 lying within the path of movement of thelocking-bolt G and adapted to be engaged thereby when said bolt is inits rear position.

Vith the parts constructed as herein described it is thought that theoperation of my improved lock may be readily understood. Briefly stated,however, it is as follows: In Fig. I of the drawings the parts are shownin their locking positions. If it be desired, however, to unlock thedoor or other device to which my lock is applied, the knob-shaft 19 isturned, forcing one end of the block 20 into engagement with theswinging rod or bar 14 and raising the tooth l() out of engagement withthe notches 9 through the pitman 13 and the bell-crank lever 11. The keyfitting within the slot 8 is then turned slightly, moving thelocking-bolt 6 a short distance to the rear, so that the tooth orprojection 10 rests upon the upper edge of the locking-bolt G. Thepressure upon the knob-shaft is then released for the purpose ofremoving the pressure of the latch-bar 3 from the shoulder 24 on thestop-bar 22. The key is then turned to its extreme rearward position oruntil the tooth or projection 10 fits within the forward notch or recess9 on the locking-bolt 6. Before this position of said locking-bolt hasbeen reached, however, its rear end is brought intov Contact with thelower arm 29 of the bell-crank lever 27. This throws upwardly the pitman2G and raises the stop-bar 22 against the pressure of the spring 25. Afurther turning of the knob-shaft 19, therefore, will, through theswinging bar 14, with which the block 2O engages, throw the latch-bar 3to its rearward position against the stop 23. The door is then free tobe opened, and thereafter the latch-bar 3 is free to be turned by theknob-shaft 19 until the locking-bolt 6 has been returned toits lockingposition. rlhe parts are shown in their unlocked positions in Fig. 2 ofthe drawings. lVhen it is desired to' change them from the positionshown in Fig. 2 to those shown in Fig. 1, it is merely necessary to turnthe knob-shaft 19 so that the tooth or projection 10 on the bell-cranklever 11 will be released from the notch or recess 9 in the locking-bolt6. Then this has been done, the said locking-bolt is free to be turnedby means of the key inserted through the slot Sand engaging the lugs 7 7on said bolt. At the same time, however, the spring 25, as well asgravity, forces the free end of the stop-bar downwardly, so that therear end of the latch-bar 3 engages the shoulder 2l on said stop-bar.The-latch-bar 3 as well as the locking-bolt 6 are thereby held securelyin the positions to which they have been turned. The spring 2l holds thelower end of the swinging bar 14 normally inwardly and thereby keeps thetooth or projection 10 in the notch or recess 9 in which -it has beenpreviously seated.

The device is extremely simple in construction,can be cheaply made, andis very effective for the purpose for which it was designed.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a lock of the character described, the combination with aslidingly-mounted latchbar, a spring for normally urging said latchbarto its outer position, and a slidinglymounted locking-bolt having meanswhereby the same may be shifted through the medium of a key, andprovided with notches or recesses in one edge thereof, o f a bell-cranklever having a tooth or projection upon one arm adapted to fit withinone or the other of said notches or recesses, a swinging rod or barpivoted to the rear end of said latch-bar, a pitman connecting the lowerend of said swinging bar with the other arm of said bellcrank lever, andmeansactuated bythe turning of the door-knob for swinging saidpivotally-mounted rod or bar, substantially as and for the purposedescribed.

2. In alock of the character described, the combination with aslidingly-mounted latchbar, a spring for normally urging said latchbarto its outer position, and a slidinglymounted locking-bolt having meanswhereby the same maybe shifted through the medium of a key, and providedwith notches or recesses in one edge thereof, of a bell-crank leverhaving a tooth or projection upon one arm adapted to fit within one orthe other of said notches or recesses, a swinging rod or bar pivot-cd tothe rear end of said latch-bar, a pitlnan connecting the lower end ofsaid swinging bar with the other arm of said bellcrank lever, aknob-shaft, and a block secured to said knob-shaft adjacent to saidswinging rod or bar, whereby upon the turning of said shaft saidpivotally-mounted rod or bar will be swung outwardly, substantially asand for the purpose described.

3. In a lock of the character described, the combination with aslidingly-mounted latchbar, a spring for normally urging said latchbal1to its outer position, and a slidinglymounted locking-bolt having meanswhereby the same may be shifted through the medium of a key, andprovided with notches or recesses in one edge thereof, of a bell-cranklever having a tooth or projection upon one arm adapted to ht within oneor the other of said notches or recesses, a swinging rod or barpivotally mounted in an elongated slot to the rear end of said latch-barand provided with an extension at its lower end having an elongated slottherein which surrounds a guide pin or stop, a spring for normallyholding the lower end of said rod orbar inwardly, a pitman connectingthe lower end of said rod or bar and the other arm of said bell-cranklever, a knob-shaft, and a block upon said knob-shaft adjacent to saidrod or bar, wh ere- IOO IIO

IZO

by upon the turning of said shaft said rod or bar will be swung to itsouter position, substantially as andfor the purpose described.

4. In a lock of the character described, the combination with aslidingly-mounted latch- 'bar, a spring for normallyurging said latchbarto its outerposition ,and a slidingly-mounted locking-bolt having meanswhereby the same may be shifted through the medium of a key, andprovided with notches or recesses in one edge thereof, of a bell-crankleverhaving a tooth or projection upon one arm adapted to fit within oneor the other of said notches 0r recesses, a swinging rod or bar pivotedto the rear end of said latch-bar, a pitman connecting the lower end ofsaid swinging bar with the other arm of said bell-crank lever, meansactuated by the turning of the door-knob for swinging saidpivotally-mounted rod or bar, a stop-bar pivoted at one end to astationary part of the device and having two shoulders thereon which areadapted to limit the rearward movement of saidlatch-bar according to theposition to which said stop-baris moved,

Aa pitman pivoted to said stop-bar and leading downwardly therefrom, anda bell-crank lever one arm of which is pivoted to said pitman and theother of which lies within the path of movement of said locking-bolt andis adapted to be engaged thereby when said locking-bolt is in itsrearward position, substantially as and for the purpose described.

5. ln a lock of the character described, the combination with aslidinglyfmonnted latchbar, a spring for normally urging said latch-vbar to its outer position, and a slidinglymounted locking-bolt havingmeans whereby the same may be shifted through the medium of a key, andprovided with notches or recesses in one edge thereof, of a bell-cranklever having a tooth or projection upon one arm adapted to lit withinone or the other of said notches or recesses, a swinging rod or barpivoted to the rear end of said latch-bar, a pitman connecting the lowerend of said swinging bar with the other arm of said bellcrank lever,means actuated by the turning of the door-knob for swinging saidpivotallymounted rod or bar, a stop-bar pivoted at one end to astationary part of the device and having twol shoulders thereon whichare adapted to limit the rearward movement of said latch-bar accordingto the position to which said stop-bar is moved, a spring for urging thefree end of said stop-bar downwardly, a pitman pivoted to said stop-barand leading downwardly therefrom, and a bell-crank lever one arm ofwhich is pivoted to said pitman and the other of which lies within thepath of movement of said lockingbolt and is adapted to be engagedthereby when said locking-bolt is in its rearward position,substantially as and for the purpose described.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

VIRGIL R. DUNNING.

Witnesses:

J. T. WILLIAMS, JENNIE lvIcQ/iivrriv.y

